Dust removing device for threshing machines



March 8, 1932,. F. .1. HERMANN DUST REMOVING DEVICE FOR THRESHING MACHINES Filed Sept. 4. 1928 4 Sheets-Sheet l March 8, 1932. F. JSHEF ANN 1,848,252

DUST REMOVING DEVICE FOR THRESHING MACHINES Filed Sept. 4, 1928' 4 Sheets-Sheet 2 .7? {6 fi/ g L--l [1T L 3 E0 7/ n n n n n n u nn H n a WM 5 %1 March 8, 1 932. F. J. HERMANN DUST REMOVING DEVICE FOR THRESHING MACHINES Filed Sept. 4, 1928 4 Sheets-Sheet 4 OOOOOOOOOOOOO W m u Patented Mar.e, 1932 Fimnz JOSEF: oF'fs nGsn, GE MANY 3 i1 i nusmimmov ne DEVICE FOR inimsnin 'macnmes YAphI iG-ation fileds'eptemlieri l 192s; s r

, 1o tacture'thereof. further-object is te mini:-

mize the weight of the apparatus and. to re (11 136 the spacezoccupiedby'fit while inaintaihg inga-hig'h capacity; a j According to theinvention the clust remov- I-5irig device is so constructed that itkca-n draw inhy, sucti'onnot onl the dusttout" of the threshing'machine" behind the-threshing: druin and'overzthe straw shakers but alsotioni other points; such for example as the short: straw '20 outlet. F urthermore by meansoi' the iinvene tion a uniformsuctioir effect is obtained over the entire breadth o f'thethreshing niaehine; and; by the" characteristic constiu ction: of the aspiratorsan automatic cleaning thereof "is Y '25 obtained from the'chafl, beai-dsand so'forth that are sucked in: 1. a 7

Fh'e accompanying;drawings illustrate the invention in: one'constructional? form" and in itsfvariousidetails 2* r 1 3b Ishows diagrammatically threshing machine with-"a dust-removing device' aeeord 'ihg'tothe-inventihn; 1 v v e Fig.- 2 shows 011* a larger: sealertheportion of the dust-removing device mounted upon thethreshingvbox t Fig; 3 'is a' plan- VieWisiI-niilar to Fig. Q-but with theeover r'emovedg 7 -Fig'.4-showsazdetailthereof, v V 1 5showsthedusterenioving po'rtiomof theshort-strawishakerand'outlet 7 Figs: '6; and Tillustrate details of Fig. 5}}

Fig. 8 shows afurtherconstructional: form o'f thisiaspirator, V l i t Fig 9-is a section on: the line I-X--IX in Fig.8, I

Fig.-j10 shows a portion f the apparatus-illustrat ed in- Fig: 8:011 an. enlargedseale, partly in section and partly in outside elevatiom'and i Fig, 11 shows a-portionoit the apparatus illustrated in Fig it, partlyhrokert away.

363,731; an in Germany ITdveinber 24,, 1324s.

The new dust re noving device is. composed of? an: upper casing 2 mounted upon the threshing hoxnl, a suetion tube 3: which is connected with the casing! 2 and; which: leads to anypart ofithe threshing'machine whiehit is desired to evacuate,-such as the short-straw outlet'i); and of a suction device li: eonneet'ed withthe' tube the threshihgihox 1 the threshing'idrunii 5:- issupported in front with the threshing hasketeti In. orderto prevent 'gTa-insof corn heiir'g thrownxolutv'ofi the threshi-ng drum hack tor-thethreshingmachine into the straw, aQeoarsely' perforated pl ate or a wider-ineshed'siveframe l is" arranged-Behind the'threshing'drunr, according to:Fi"g. 1; and on the side: of this perforated pl ate oris'ieve plate 'l; whichzis inclined to the threshing druni are provided-l plates 8 arranged like the slats of; a Venetianvblind, which' catch the grains thrown out 01" the threshing basket.

Through the Wide-meshed; sieve ori coarsely pertorat'ed plate of. the frame: 'Z, the air laden with dust. passes without hindrance, sothat the eui'relit of suctionairis in no wa impeded thereby. Fignrell show-saviewot this sieve trame7,.with therslats 8. fliechaiirldserves for adj listing this grain catchin-g' device;

The:suctiomeasihgfl mounted upon the threshing; box '1 is illustrated iii-its details ih Figs; 2, 3 and 4*. T It consists of a 150x211, pref-1 erably consistingof'wood, extending'over the breadth of the threshing: machine; theihot tom 12 of theboxfbeing provided with one'or more a circular apertures 13; Within the box are arranged a number offan wheels 13 cor"- respondingtothe-number of theseiapertures';

the fan wheels :beingj rotatable about vertical axes. The driving ofthesefan wheels'in effected, acc0rdingi to Fig. 2; by a shaft 16 cm" itying'azhelt-pulley 15, through the medium of hevelftransmission gears 17. According to the invention these fanwheels Hare con nected underneath with circularsieves' 18', which fit accurately into the aperturesl in the bottom 12 of the recept'aele ll; "Thus the sieves revolve at the same speed as the fan wheels, so that by the centrifugal actionresuitingrtherefrom the foreign bodies sucked onto thesieves' are thrownoutward's and cone sequently release themselves from the sieves;

In order also to enable particularly light bodies, such as portions of straw, stalk or the like to be released, there are arranged underneath the sieves special strippers which consist of short prongs 20 of resilient wire fitted on to wooden strips .19, as shown in Fig. 4. The distance between the sieves and these resilient wire prongs is so dimensioned as to correspond to about half the thickness of the straw stalks, but care should be taken that the spring wires do not come into contact with the sieve, because in consequence of the high speed or revolutionof the sieves such contact would result in the sieves and the wire rods damaging or destroying one another, andmighteven produce sparks which would give rise to a danger of fire. The resilient wire rods are somewhat obliquely positioned according to Fig. 3, so that the portions adhering to the sieves are pushed on these resilient wire rods. I

- To the casing 2 of its box 11 is connected on the one hand a tube 21 extending to any desired distance and opening into the atmosphere, for carrying away the dust sucked in, and on the other hand the suction tube 3, which, as already mentioned, leads to a suction device 4, the object of which is to remove dust from the short-straw chamber for example. This suctiondevice consists, according to Fig. 5,of a tube 22 which extends over the entire breadth of the threshing machine and which may according to Fig. 5 be rotated by a belt-pulley 23, of which the shaft 24 is supported in any convenient manner. The connection between the tube 22 and the suction tube 3 maythen be constructed in a known manner, in such a way that the tube 22 is caused to rotate at'the desired speed.

Thetube 22 consists of wire gauze or of perforated or slotted sheet material, but the meshes or 'aperturesin the tube must be so fine that only the dust-laden air can pass through them and not any larger particles of chafl', beards and the like. Now in order to obtain a uniform suctioneilect throughout the entire length of the tube 22, the interior of this tube is divided into individual chambers 26by tubes 25 widening out like funnels towards one side. The tubes 25, of which only two are shown in the drawings, areinserted one into the other, and the funnel-like expansion of the tubes, which become gradually smaller in cross section, effects on the one hand a separation of the chambers 26 and on the other hand, with the second tube 25 inserted therein, such a narrowing of the cross section that the suction effect is distributed uniformly between the variouschambers 26. According to Figs. 6 and 7 in the funnellike expansions of the tubes 25, guide plates 27 are also arranged concentrically with the inner tube, in order also to regulate and equalize the suction effect within the individual chambers.

In order to remove the chaff, beards and the like that settle on the sieve tube 22, according to Fig. 5, a brush 28 is provided, against which the sieve tube 22 bears, so that as it rotates it is freed by the brush from all adherin constituents.

if it gives rise to difficulties to rotate the sieve tube 22, according to Fig. 9, a stationary tube 29 may be used, which is only perforated in the upper half of its cross section, but may even be closed I On the under side the suction tube 29 has I a series of small nozzles or pipe unions 30, which may be connected with the tube in any convenient manner. These nozzles or unions may be either pressed in the tube 29, or, according to Fig. 10, may be riveted to it. Each of these nozzles 30 carries, by means of a short air-tight resilient connecting tube 31 preferably made of rubberized linen, a tubular body 32, which is closed by a bottom at its lower end. The connecting of the tubing 31 with the nozzle 30 and the body 32, may be effected in any convenient manner, for instance by means of bands 33 or the like. The sieve body may consist of a wire cylinder or of a cylinder of sheet material with perforations of suitable size and distribution. I

The sieve bodies 32,. suspended in a readily movable manner from the flexible tubes 31, hang'vertically downwards when in a positionof rest. Now when the threshing machine is being operated, the sieve bodies 32, in consequence of their resilient and readily movable suspension. are set in vibratory motion, thus preventing the settling of any rather large particles such as chafl, beards. or the like or else shaking off any particles of straw or the like that have already settled thereon. chine also raises and moves the sieve bodies,

The shortstraw leaving the maas shown in Fig. 9, the straw rubbing against the sieve bodies, so that the same success in cleaning the sieves isobtained as with brushes rubbing along the sieve surfaces. The sieve bodies 32 may of course be of some shape other than the tubular shape illustrated. They may be flattened, angular, or of'any other suitable hollow form.

It may be observed that the sieve tube shown in Figs.-5 and 8 obviously admits of being used at some other part of the threshing machine. The suction box 2 may be replaced by a similar sieve tube, which must then in any case be equipped with a special suction blower. Similarly also the suction box may be connected to other parts of the threshing machine; and the sieve'tubes according to Figs. 5 and 8 may be combined with one another in such a way that one is arranged at the top above the straw shakers, and the other in the short-straw chamber.

What I claim is A dust-removing device for threshing machines, comprisinga suction and sifting device, a sieve tube arranged at a partofthe 7 machine from which dust is to beremoved,

a suction pipe connecting the suction and sifting device with the sieve tube, interengaging tubular elements arranged co-axially in the sieve tube, the cross-sectional area of the tubular elements decreasing with their distance from the suction pipe, and a funne1- like expansion atthe end of each tubular element remote from the'suction 'pipe, the

said expansion surrounding the inner end of' a an adjacent tubular element, and the free a edges of the funnel-like expansions being close enough to the surface of the sieve tube to divide the sieve tube into a series of compartmehts, V In testimony name to this specification.

FRANZ JOSEF HERMANN.

whereof I have signed my 

